This comprehensive product introduction article outlines the exceptional qualities and characteristics of A517GrS/A517 Grade S, a quenched and tempered high-strength alloy steel pressure vessel plate, specifically designed for demanding applications requiring superior mechanical properties and corrosion resistance. The discussion encompasses its detailed chemical composition, mechanical properties, heat treatment state, producible size range, low-temperature impact testing, primary application scenarios, and relevant supply cases by TJC Steel Group.

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Introduction:

A517GrS/A517 Grade S, an integral part of the ASTM A517/A517M standard, represents a pinnacle in high-performance steel plates intended for use in pressure vessels, boilers, and other critical structural components. Its exceptional combination of strength, toughness, and corrosion resistance, achieved through rigorous quenching and tempering processes, makes it an ideal material choice for various industries.

Chemical Composition:

The chemical composition of A517GrS/A517 Grade S is meticulously balanced to ensure optimal performance. The key elements and their approximate percentage ranges are as follows:

- Carbon (C): 0.15% - 0.21%

- Silicon (Si): 0.15% - 0.35%

- Manganese (Mn): 0.7% - 1.0%

- Phosphorus (P): ≤ 0.035%

- Sulfur (S): ≤ 0.035%

- Chromium (Cr): 0.4% - 0.65%

- Molybdenum (Mo): 0.15% - 0.25%

- Additional alloying elements such as boron (B), vanadium (V), and titanium (Ti) are also present in trace amounts, enhancing the steel's mechanical properties and corrosion resistance.

Mechanical Properties:

A517GrS/A517 Grade S exhibits remarkable mechanical properties, ensuring reliability and durability under extreme conditions. Key mechanical properties include:

- Tensile Strength: 725 - 930 MPa for plates up to 65 mm thick, with a minimum yield strength of 690 MPa. For thicker plates (65 - 150 mm), the tensile strength remains within 725 - 930 MPa, while the yield strength is ≥ 620 MPa.

- Elongation: ≥ 14% for thicker plates, ensuring good ductility.

- Reduction of Area: ≥ 45% (circular specimen) for thicker plates, indicating high resistance to fracture.

- Low-temperature toughness is also exceptional, as evidenced by favorable Charpy V-notch impact test results at various temperatures.

Heat Treatment State:

All A517GrS/A517 Grade S plates undergo a rigorous quenching and tempering process to achieve their desired mechanical properties. The plates are heated to a temperature not less than 900°C (1650°F), quenched in water or oil, and then tempered at a temperature not less than 620°C (1150°F) for at least half an hour. This heat treatment regime ensures uniform microstructure and optimal mechanical properties throughout the plate.

Producible Size Range:

A517GrS/A517 Grade S is available in a wide range of sizes to meet diverse application requirements. Typical thickness ranges from 8 mm to 180 mm, with widths up to 2500 mm and lengths exceeding 12000 mm. Custom sizes can also be produced upon request, catering to specific project needs.

Low-Temperature Impact Testing:

To ensure reliability in low-temperature environments, A517GrS/A517 Grade S undergoes rigorous Charpy V-notch impact testing at various temperatures. The plates consistently demonstrate excellent toughness, even at subzero temperatures, making them suitable for applications in cold climates or cryogenic conditions.

Primary Application Scenarios:

A517GrS/A517 Grade S finds widespread use in industries requiring high-strength, corrosion-resistant steel plates, including:

- Petrochemical Industry: For reactors, heat exchangers, storage tanks, and piping systems handling corrosive chemicals and fluids.

- Energy Sector: In power plants, especially for boiler components, pressure vessels, and piping systems in boilers and steam turbines.